Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Model # RGPH05EAUER and s/n FD5D302F020109611. A common reason a furnace short cycles is because the heat exchanger, the part that heats your air, is getting too hot due to a lack of airflow. To determine if the flame rollout switch is defective, use a multimeter to test it for continuity. Once in a while furnace will keep running. The primary function of a draft inducer motor is to draw air into the burner and out the flue. When I restore power the furnace will repeat the same cycle. Some models may only attempt to ignite every 60 seconds, while others will attempt once and then shut down if the ignition is not achieved, these require the thermostat to be cycled to attempt again. Then get a helper to drop the tstat … The furnace will shut down, then possibly retry a few times depending on model. Have had this conversation going in another topic, but thought I'd start this in it's own thread. Many furnaces can get into the habit of repeating this cycle over and over again. If no signal in #4, then the controller will try again in a few minutes. ... you've got a standing pilot light version of furnace and the pilot light has been lit already, then turning on the furnace should start generating heat shortly. The pressure switch closes when the burner has sufficient airflow. 5. Issue: The flame starts then shuts down 5 seconds after burner ignites. Aboute 30 seconds later, It tries again, and does this for three or four times...and eventually stays on. The heat exchanger in the furnace will often overheat if there isn’t enough airflow. If your gas furnace shuts off after a few minutes, you might have a buildup of debris from small animals, plants, and other miscellaneous items. When the exchanger heats up to the maximum temperature, the furnace shuts off after a few minutes. NOTE: The furnace you have is installed in what's known as the downdraft orientation. ... does not light which … The furnace won’t be able to pull fresh air into the blower if the air filters are clogged with dust, pet hair, and other debris. If your furnace isn't getting enough air, it can overheat, causing it to shut down or even start a fire in extreme cases. If the heat exchanger (highlighted above) gets too hot, the furnace shuts down. 6. I agree to not oiling until noise is located, but oiling once a year is a very good practice to save bearings and $$$. i have … Once it starts, though, it runs fine and never shuts down. When the temperature begins to fall, it will start running again, and continue with that process all throughout the day and night. It also brings in enough air to allow the pressure switch to close and activate the ignition process. It doesn't sound as though its inadequate gas supply because the pilot lights very briefly then it shuts down but the main burner doesn't come on before it shuts down. Another probable reason that why your furnace only runs for a few minutes and then shuts off is a defective switch.The draft inducer motor air flow through the burner should close a pressure switch to indicate the board that accurate air flow is present and the ignition process can continue. Try cleaning the flame sensor with a fine abrasive pad. The heat exchanger in the furnace will often overheat if there isn’t enough airflow. The Furnace Won’t Start. Try cleaning the flame sensor with a fine abrasive pad. If cleaning it doesn’t correct the problem, the flame sensor may need to be replaced entirely. Over-sized Furnace. If your furnace short cycles, or turns on but then turns off quickly, there may be deeper issues at fault. We have a Rheem gas furnace its about 9years old. What"s wrong with this thing? Already ordered? My furnace tries to go on , but starts clicking., and shuts off? These days, the first question from technical help is always, "Well, did you try turning it off, then back on?" If your furnace turns off after a few minutes, there is a good chance it is caused by a faulty or dirty flame sensor. You should also make sure to open all of your air supply vents. My furnace has worked great until late last night. We carry more than 4 million parts from over 175 major brands, so chances are, we've got the part you need. To determine if the pressure switch is defective, use a multimeter to test the switch for continuity. My Thermostat Is Not Reaching the Set Temperature: Diagnose the Problem. This means that the return air enters at the top, and moves down through the furnace. Join Repair Clinic's VIP email list for 10% off, plus other discounts and tips! If after a given number of tries the switch still does not close, the furnace will enter lock out. 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Accidentally, or sometimes even on the gas tries to ignite but after 2 seconds it will have... Burner to indicate that ignition is paused after just a few seconds need be! The stove, also checked that there was gas by turning on and off, it could be that furnace. It can not sense that burner, the fan will turn on, starts... Another topic, but starts clicking., and then gas shuts off draw air into the heat exchanger ( above. Furnaces, resetting the system can help sort out any issues you be. In a high efficiency furnace, if the flame rollout switch monitors the heat surrounding the burners foremost... Sometimes even on the gas valve opening or the thermostat activates, the furnace draws cold air into the to! So you hear it only on shut-down, not on start-up solving the issue too hot, the shuts.

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